import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        HttpSession session=req.getSession(false);
        if (session == null) {
            resp.getWriter().write("<h3>当前你尚未登录</h3>");
            return;
        }
        Integer visitCount = (Integer) session.getAttribute("visitCount");
        visitCount +=1;
        session.setAttribute("visitCount",visitCount);
        resp.getWriter().write("<h3>visitCount:"+ visitCount+"</h3>");

    }
}
